Complete test coverage for all roles in the centralized AgentEnv function: - TestAgentEnv_Deacon: verifies deacon env vars (GT_ROLE, BD_ACTOR, GIT_AUTHOR_NAME) - TestAgentEnv_Boot: verifies boot env vars including BD_ACTOR=deacon-boot Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>